Microplastic contamination in soil has received increasing attention since excessive plastic debris has been emitted directly into the terrestrial environment. Once released into the terrestrial environment, microplastics can be aged via photo- and thermally-initiated oxidative degradation, hetero-aggregation, and bioturbation. Aging affects the physiochemical properties of microplastics with the increase of surface roughness and oxygen-containing groups, which could enhance the sorption and mobility of microplastics in the soil and groundwater environment. However, the interactions among aging, sorption, and transport of microplastics in the terrestrial system have not been unveiled. This review clarifies the key processes of microplastics transport pathways in soil and groundwater ecosystems influenced by aging and sorption under various scenarios. Co-transport of microplastics and sorbed contaminants are also addressed to help understand the risks associated with heavy metals, organic contaminants, and engineered nanoparticles in the soil environment. Overall, this review elaborates the most pressing research limitations on the present literature and highlights the future perspectives to investigate the possible broad transport pathways of microplastics in soil.

由于过量的塑料碎片直接排放到陆地环境中，土壤中的微塑料污染越来越受到关注。一旦释放到陆地环境中，微塑料就可以通过光和热引发的氧化降解、异质聚集和生物扰动进行老化。老化随着表面粗糙度和含氧基团的增加而影响微塑料的理化性质，这可以增强微塑料在土壤和地下水环境中的吸附和迁移。然而，地球系统中微塑料的老化、吸附和运输之间的相互作用尚未公开。该综述阐明了在各种情况下受老化和吸附影响的土壤和地下水生态系统中微塑料运输途径的关键过程。还解决了微塑料和吸附污染物的共同运输问题，以帮助了解与土壤环境中的重金属、有机污染物和工程纳米粒子相关的风险。总的来说，这篇综述阐述了目前文献中最紧迫的研究局限性，并强调了研究微塑料在土壤中可能的广泛运输途径的未来前景。